jmc

Distributing the negation gives $$3x-1-(-x)=5,$$ so $$3x-1+x=5.$$ Simplifying the left side gives $4x-1=5$. Adding 1 to both sides gives $4x=6$, and dividing by 4 gives $x=\frac{6}{4}=\boxed{\frac{3}{2}}$.